﻿// Copyright 2007-2015 Chris Patterson, Dru Sellers, Travis Smith, et. al.
//  
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the 
// License at 
// 
//     http://www.apache.org/licenses/LICENSE-2.0 
// 
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
// CONDITIONS OF ANY KIND, either express or implied. See the License for the 
// specific language governing permissions and limitations under the License.
namespace MassTransit.Util
{
    using System;
    using System.Threading;
    using System.Threading.Tasks;


    delegate void AsyncTimerCallback();


    sealed class AsyncTimer :
        CancellationTokenSource,
        IDisposable
    {
        internal AsyncTimer(AsyncTimerCallback callback, int dueTime)
        {
            Task.Delay(dueTime, Token).ContinueWith((t, s) =>
            {
                AsyncTimerCallback cb = (AsyncTimerCallback)s;
                cb();
            }, callback, CancellationToken.None,
                TaskContinuationOptions.ExecuteSynchronously | TaskContinuationOptions.OnlyOnRanToCompletion,
                TaskScheduler.Default);
        }

        internal AsyncTimer(AsyncTimerCallback callback, TimeSpan dueTime)
        {
            Task.Delay(dueTime, Token).ContinueWith((t, s) =>
            {
                AsyncTimerCallback cb = (AsyncTimerCallback)s;
                cb();
            }, callback, CancellationToken.None,
                TaskContinuationOptions.ExecuteSynchronously | TaskContinuationOptions.OnlyOnRanToCompletion,
                TaskScheduler.Default);
        }

        public new void Dispose()
        {
            Cancel();
        }
    }
}